Demountable rim for vehicle tires



April 19, 1932. F. H ROBINSON DEMOUNTABLE RIM FOR VEHICLE TIRES Filed Oct. 11, 1929 INVENTbR.

a. a. 5 Mar A TTORNEY Patented Apr. 19, 1932 UNITED STATES "PATENT o Ficf FREDERICK H. ROBINSON, OF NEW YORK, N. Y., ASSIGNOR F ONE-HALF T0 TERENCE COOKE, OF NEW YORK, N. Y.

DEMOUNTABLE RIM FOR"VEHICLE TIRES Application filed October 11, 1929. Serial No. 398,847.

This invention relates to new and useful improvements in a demountable rim for vehicle tires.

The invention has for an object the provision of a device of the class mentioned which is of simple durable construction, dependable in use and efiicient in action, and which can be manufactured and sold at a reasonable cost. I

The invention proposes a demountable rim consisting of a circular rim made of several sections hinged together and arranged for maintaining circular form by the clamping action of a memberon the air inlet stem of the inner tube of a tire upon which the rim is mounted, and for being collapsed to be conveniently removed from the tire upon removal of said member.

At the present time there are numerous demountable rims on the marxet but each have defects that prevent commercial success. means for holding the sections in circular form. The present invention eliminates massive construction when compared with previous devices. It may easily be conceived that a massive structure is exposed to dirt which binds it and thus prevents satisfactory operation.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more par ticularly set forth.

In the accompanying drawings forming a material part of this disclosure Fig. 1 is an elevational view of a tire provided with thedemountable rim constructed according to this invention, one section being shown moved for collapsing the rim.

Fig. 2 is a vertical sectional view taken on the line 22 of Fig. 1.

Fig. 3 is an enlarged detailed elevational view of a portion of Fig. 1 showing the rim in operative position.

Fig. 4; is an enlarged detailed fragmentary sectional View taken on the line 4:% of Fig. 2.

These defects notably exist in the Fig. 5 is aside elevational view of the rim, per s-e.

Fig. 6 is a view simi ar to Fig- 5butshowing the rim collapsed.

Fig. 7 is an elevational view looking in the direction of the arrows 7-7 of Fig. 3.

Fig. 8 is a similar view looking inthe direction of the arrows 88 of Fig. 5

Fig. 9 is an enlarged detailed fragmentary sectional view as though taken on the line 99 of Fig. 2 but ill'ustrating another embodiment of the invention;

The demountable rim consists of rim 10 made of several sections, namely 11,- 12 and=13 hinged together andarranged for maintaining circular form by the clamping action of member 1 1 on the airfinlet stem l5 of the inner tube 16 ofa tire, and for being collapsed to be conveniently removed from the tire upon removal of said member 70 14. r The said circular rimis of conventional a circular design for engaging withina tire shoe. Section 11 is substantially one-half of the circumference, and sections 12 and 13 are each oneequartel. thereof The remote ends o f the sections 12 and 13 are hinged to the I ends of the section 11. i The hinge construction is simple and efiicient and consists of a bent member 17 attached upon the section 11 and engaged by a pintle 18 supported on the other section.

In Figs. 1 to 3, a tire 19 has been illustrated andconsists of a shoe 20 and the said inner tube 16.. The innertube is provided with the customary air inlet stem 15 threaded on its outer side. -The member 14:- threadedly engages upon the stem. 15 and constitutes the conventional nut for this stem. I The adjacent ends of the sections 12 and 13 termi-f pivoted upwards to a position shown in Fig. 9"

cber. "ridge 23 projecting fromeach;of'the'ad 1. Next the stem 15 may be bent to the other side and the other section pivoted up. The rim may then be removed.

In Fig. 9, a modified form of the device has been illustrated which is provided With a means for communicating 'stresses and strains-finale the-sectionsof the rim attempting to collapse, to the clamping memo-l This, means comprises a semi-circular jacent ends of the sections 12 and 13'." The semi-circular ridges together constitute a complete circle. The member 14 is formed With a circular recess 24 arrangedior receiving the ridges 23.

- According: to ---this arrangement= the demountable rim is firmly locked in its circular form. Any stresses-and"strains due-to the attempt to collapse are communicated to: the {nut 14" which is designed for carrying such loads.

It i is pointed out that Y without the I use 'of the ridges and tlierecess, strainswill be communicated to the-inner tube 16 which is-flexible to some degree even' in i-nfiated condition. This arrangement #therefore also produces a more rigidrim While I have v shown and described the preferred embodiment er my'invention; it is i to lac-understoodthat-I do not li mitmyself f to the precise construction-herein. disclosed andthe right is reserved to all changes-and modifications coming ithin th'e scope of the I invention-as defi'ned in theappende'd claim.

Ha-vingathiisdeseribed'my invention- What I claim as new,"anddes-ire-tosecure lay-United States Letters Patent is I? Ifia sp lit demountable tirerim 'h'aVing tWO free ends,-"sa-id -ends-havin'g;1opposed recesses whieh together form" an opening through "-vvh ich the valve-stemof the tire is adapted to pass means for cennectir ig said ends comprising asemi-circular ridge on each of said ends' -adja-cent said opening for forminga complete-circle around the opening when the ends) are in engaged position, the-outer'and innensfirfzicesof said ridges being-substantially parallel to each other and extending-substantially atrig-ht angles -t0-a plane tangent to =the"rimat the *meetingendsthereof; a threaded valve stem from said tire extending through said openingand a nut threadedly engaged onsai'dvalveste'm and formed With 'a compl'ementary circular recess for slidable frictionalengagement over said circular ridge, whereby; the-nut maybe screwed along 'on-tlfe valve stem to a positionengagingthe "niiige-to prevent separation of said ends.

In testimony whereof I haveafiiked my signature? -FREDERIGK'HIROBINSON: 

